Tomos A31988, Workshop Manual, Page: 11 / 31

11
CHECKING ENGINE PARTS AND ASSEMBLIES
Check both crankcase halves for possible damages or distortions, particularly the joint surfaces, to avoid
later leaking of oil from the gearbox.
Check all bearings. If clearance is noticed, the bearings must be replaced.
Check the crankshaft between the center of a horizontal alignment tool and measure out-of-round on all
the points indicated in figure 35.
Permissible out-of-round should be within 0.01 mm at check pints 2 and 3 and 0.02 mm at check points
1 and 4. Check if the crankshaft conical part is damaged, inspect the thread on semiaxles and the
keyway.
Check piston surfaces for possible damages. With micrometer check piston diameter on points d1, d2,
d3 and d4 at right angles to gudgeon pin and compare the reading with the corresponding group on
piston and in the table (fig 36)
Figure 35
Figure 36